2112781671607 has 4 divisors (see below), whose sum is σ = 2112811728040. Its totient is φ = 2112751615176.

The previous prime is 2112781671587. The next prime is 2112781671661. The reversal of 2112781671607 is 7061761872112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2112781671607 - 2¹⁵ = 2112781638839 is a prime.

It is a super-3 number, since 3×2112781671607³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112781671677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14922528 + ... + 15063445.

It is an arithmetic number, because the mean of its divisors is an integer number (528202932010).

Almost surely, 2^{2112781671607} is an apocalyptic number.

2112781671607 is a deficient number, since it is larger than the sum of its proper divisors (30056433).

2112781671607 is an equidigital number, since it uses as much as digits as its factorization.

2112781671607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30056432.

The product of its (nonzero) digits is 395136, while the sum is 49.

The spelling of 2112781671607 in words is "two trillion, one hundred twelve billion, seven hundred eighty-one million, six hundred seventy-one thousand, six hundred seven".